This is hardware-specific, so there's no intention to fix it directly in Xubuntu. I found a related forum post here with two confirmed solutions: https://forum.xfce.org/viewtopic.php?id=17176
** Changed in: xubuntu-default-settings (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1990921 Title: Brightness keys not working on Chromebooks To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xubuntu-default-settings/+bug/1990921/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs